Victims of the Florida nightclub shooting

A mourner holds up candle against a rainbow-lit backdrop during a vigil on Monday, June 13, 2016, for those killed in a mass shooting at the Pulse nightclub in downtown Orlando, Fla. (Photo: David Goldman/Associated Press)

Victims of the Florida nightclub shooting

A gunman, Omar Mateen, wielding an assault-type rifle and a handgun, opened fire inside a crowded gay nightclub in Orlando, Fla., early Sunday, June 12, 2016, killing 49 people and wounding 53 others in the deadliest mass shooting in modern U.S. history. (AP)